CBS laboratories 4100 Manuel

OPERATING

AND

MAINTENANCE

INSTRUCTIONS

OCTOBER

1972

Models,

4100,4110

Volumax

PROFESSIONAL

PRODUCTS

CBS

LABORATORIES

Division

Columbia

Broa casting

System,

Inc.

Stamfor ,

Connecticut

06905

Section

TABLE

CONTENTS

Title

INSTALLATION

Unpacking

Mec anical

Installation

and

Operation

Considerations

Power

Source

Electrical

Connections

THEORY

OPERATION

General

Input

Section

(Board

A5)

AGC

Amplifier

(Board

A3)

Hig

Frequency

Processor

(Board

A4)

Output

Section

(Board

A5)

Power

Supply

(Board

A3)

OPERATIONAL

SET-UP

General

Set-Up

Stereop onic

Volumax

Unit

Set-Up

Monop onic

Volumax

Unit

Proof-of-Performance

Measurements

MAINTENANCE

General

Alignment

Procedure

Troubles ooting

Input

Section

(Board

A5)

Troubles ooting

Hig

Frequency

Control

Section

(Board

A4)

Troubles ooting

Output

Section

(Board

A5)

Troubles ooting

AGC

Section

(Board

A3)

Troubles ooting

Gain

Meter

Circuit

INTRODUCTION

General

Functional

Description

P ysical

Description

Warranty

Service

and

Repair

Specifications

一

•

TABLE

CONTENTS

(cont)

Page

Title

Section

7-1/7-2

DRAWINGS

LIST

ILLUSTRATIONS

Title

Fig.

No.

1-3 1-4

1-4

2-4

2-8

3-1

Volumax

Controls

3-0

5-1

5-0

1-1

1-2

Volumax

Block

Diagram

Volumax

Amplitude

Response

4-0

4-4

4-1

4-2

2-1

2-2

2-3

Locations

Circuit

Boards

and

C assis

Parts

Volumax

Unit

Volumax

Automatic

Peak

Controller

Area

Potential

Overmodulation

(75-四

Pre-Emp asis

Curve)

Diagram

and

Oscilloscope

P otos

S owing

Audio

Peak

Levels

Cymbal

Clas

wit

and

wit



out

Pre-

Emp asis

Simplified

Block

Diagram,

Volumax

Model

4100

1-1

1-3

6-1

6-2

6-3

6-4

6-7

6-10

6-13

PARTS

LISTS

General

Resistors

Diodes

and

Transistors

Manufacturers

Name

Abbreviations

Main

Assembly

(Model

4110

4100)

Hig

Frequency

Board

and

Input-Output

Board

and

Power

Supply

and

AGC

Board

Front

Panel

Assembly

(Model

4110

4100)

2-2

2-3

2-5

2-6

Outline

Drawing

(S eet

S eets)

Outline

Drawing

(S eet

S eets)

Typical

Volumax

Installation

Block

Diagram

Typical

Attenuator

for

Volumax

Input

Line

(Sc ematic

Diagram)

Transformer

Re-Strapping

Connections

for

150-O m

Operation

LIST

ILLUSTRATIONS

(cont)

Title

Fig.

No.

Page

7-7/7-8

7-3

7-9/7-10

7-4

LIST

TABLES

Title

Page

Table

No.

iii

5-1

5-2

7-1

7-2

Power

Supply

Voltages

Signal

Voltages

5-9

7-3/7-4

7-5/7-6

Volumax,

Internal

Interconnections

Hig

Frequency

Processor

Board

A4,

Sc ematic

and

Parts

Location

Diagrams

Input-Output

Board

Sc ematic

and

Parts

Location

Diagrams

Power

Supply-AGC

Board

A3,

Sc ematic

and

Parts

Location

Diagrams

SECTION

INTRODUCTION

1-1.

GENERAL

T is

manual

provides

instructions

for

t e

CBS

Laboratories

Model

4100

(Monaural)

and

Model

4110

(Stereo)

Volumax*

automatic

audio

peak

con



trollers.

T ese

instruments

ave

been

designed

for

use

and

broadcast



ing

applications

w ic

t e

use

pre-emp asis

mandatory.

Eit er

instrument

will

enable

t e

full

modulation

capability

t e

transmitter

utilized

wit

risk

overmodulation.

replaces

any

limiter

clipper

t at

may

now

use.

W en

used

wit

SCA**

systems,

prevents

crosstalk

caused

overmodulation

from

entering

into

adjacent

c annels

s ould

operated

wit

well-controlled

audio

input

levels

suc

provided

t e

CBS

Laboratories

Audimax*

automatic

level

control.

Figure

1-1.

Volumax

Automatic

Peak

Controller

1-1

VOLUMAX

CBS

Laboratories

Trademark

Subcarrier

Aut orization

INTRODUCTION



1-2.

FUNCTIONAL

DESCRIPTION

T e

Models

4100

and

4110

are

late

designs

based

t e

foundation

establis ed

t e

earlier

Model

410

Volumax

unit.

T ey

extend

t e

original

tec nology

yield

cleaner,

brig ter

sound

w ile

still

retaining

absolute

protection

against

overmodulation.

very

familiar

problem

and

broadcasting

caused

t e

mandatory

75-p.s

pre-emp asis

curve

(fig.

1-2).

T is

long

establis ed

requirement

t e

FCC

for

t e

improvement

t e

overall

signal-to-noise

ratio.

t e

time

t e

and

broadcasting

standards

were

adopted,

t e

long-term

average

spectral

distribution

music

signals

s owed

steady

decline

wit

frequency

above

000

Hz.

T is

meant

t at

ig -frequency

pre-emp asis

wit

subsequent

de-emp asis

t e

receiver

could

employed

improve

t e

over



all

signal-to-noise

ratio.

However,

recent

years,

improvements

and

ot er

c anges

recording

tec niques

conjunction

wit

social

c anges

musical

style

ave

led

increasing

problems

wit

t e

overmodulation

caused

ig -

amplitude

ig -frequency

program

signals.

T e

Volumax

unit

solves

t is

problem

uniquely

quadruple

action

control.

Low-,

middle-,

and

ig -frequency

portions

t e

program

wave

are

independently

processed

and

overall,

instantaneous

final

limiting

used

assure

t at

overmodulation

will

occur.

See

also

figures

1-3

and

1-4.

1-3.

PHYSICAL

DESCRIPTION

T e

Models

4100

and

4110

Volumax

units

are

oused

t e

same

new

slimline

packages

t e

CBS

Laboratories

Audimax

and

a-m

Volumax

units.

1-2

INTRODUCTION

MODULATION

800%

400%

200%

100%

100

1000

20000

1-3

Figure

1-2.

Area

Potential

Over



modulation

(75-ps

Pre-Emp asis

Curve)

INTRODUCTION

9 B

pre-emphasis

1-4

Figure

1-3.

Diagram

and

Oscilloscope

P otos

S owing

Audio

Peak

Levels

Cymbal

Clas

wit

and

wit out

Pre-Emp asis

Figure

1-4.

Simplified

Block

Diagram,

Volumax

Model

4100

O B

INTRODUCTION

T is

package

requires

only

1-3/4

inc es

eig t

standard

19-inc

rack

and

18-1/2

inc es

dept

be ind

t e

front

panel.

T e

reliable

solid-state

circuitry

functionally

packaged

t ree

circuit

boards

t e

monaural

Volumax

model

and

five

circuit

boards

t e

stereo

model.

Bot

models

are

equipped

wit

appropriate

test

points

speed

t e

process

maintenance

tests

troubles ooting

procedures.

T e

entire

unit

slides

forward

rack

slides

for

easy

servicing

wit out

disconnections

from

t e

transmitting

system.

Front

panel

controls

are

conveniently

arranged

and,

t e

stereo

unit,

are

grouped

according

c annel-

left

c annel

controls

t e

left

t e

unit

and

rig t

c annel

controls

t e

rig t

t e

unit.

front

panel

meter

indicates

t e

relative

degree

gain



duction.

T e

unit

can

operated

from

eit er

115-

volt

230-volt

single-p ase

50-

60-Hz

power

source.

delivery,

t e

unit

wired

for

115-volt

opera



tion.

Wiring

c anges

for

230-volt

operation

are

explained

paragrap

2-3.

1-4.

WARRANTY

standard

warranty

card

been

included

wit

your

Volumax

unit.

validate

your

warranty,

complete

and

return

t e

postcard

section

CBS

Laboratories

soon

possible.

1-5.

SERVICE

AND

REPAIR

t ere

difficulty

operating

maintaining

your

Volumax

unit,

call

your

local

aut orized

distributor

from

w om

you

originally

purc ased

t e

unit.

you

not

know

t e

name

and

address

your

local

distributor,

call

1-5

INTRODUCTION

CBS

Laboratories,

Professional

Products

Department,

Stamford,

Conn.

06905,

telep one

(203)

327-2000.

1-6.

SPE

CIFICATIONS

Input

impedance

Output

impedance

600

150

o ms,

balanced

unbalanced

-22

dBm

Input

level

Maximum

peak

output

level

+28

dBm

Frequency

response

Harominc

distortion.

Attack

time

Recovery

time

Signal-to-noise

ratio

Greater

t an

dB.

Wit in

1/2

Amplitude

P ase

Wit in

degrees

+55°C.

(+130°F)

1-6

200

(low

frequencies

)

(middle

frequencies)

阳

less

( ig

frequencies

)

Less

t an

1%,

below

t res old

limiting,

15,

000

Hz.

Maximum

operating

temperature

Tracking

accuracy

(stereo,

model):

Between

|is

and

ms,

depending

program

waveform.

600

o ms,

balanced

unbalanced;

kilo ms

150

o ms

available

request.

±1

dB,

15,

000

below

limiting

t res old.

Variable

function

level

above

limiting

t res old,

reac ing

t e

75-|is

de-emp asis

c aracteristic

±1

maximum

level.

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